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[July 01, 2011] (AP) Active weather is expected across the central U.S. as a cold front in Canada pulls a front through the Plains.

Counterclockwise flow around a low pressure system moving through central Canada pushes a cold front though the northern Plains and upper Midwest. Warm and moist air pouring in ahead of this front from the Gulf of Mexico will produce scattered showers and thunderstorms across the Dakotas and Great Lakes. Thus, heat advisories will remain in effect for most of the Plains and upper Midwest. Once the front passes in the North, the heat will subside. However, the cold front will not pass through the central and southern Plains until late Friday night and into Saturday; thus, heat advisories will remain in effect through Friday. High humidity associated with this air mass allows for high heat index values and uncomfortable, muggy conditions. Expect highs over 100 degrees in the Plains, with heat indexes up to 110 degrees.

Meanwhile to the south, remnants of Tropical Storm Arlene will continue moving westward over Mexico. The system will pull more moisture onshore from the Gulf of Mexico, spreading periods of heavy rain and strong winds over most of Mexico. A few more rain showers will extend into southern Texas, but significant rainfall is not anticipated.

In the East, high pressure builds in behind a cold front that has pushed off the East Coast. The ridge will bring a sunny and hot day to most of the eastern U.S., with highs ranging in the 80s in New England and in the 90s in the Mid-Atlantic and Southeastern states.

Temperatures in the Lower 48 states Thursday ranged from a morning low of 33 degrees at Big Bear City, Calif., to a high of 107 degrees at Russell, Kan.

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[Associated Press article from Weather Underground]